Office (OOXML) malware analysis — malicious · d30add8c369fd6b2

MALICIOUS

Office (OOXML)

41.8 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300

MD5: 85a05832181a2af82e4a5e73f5696608 SHA-1: 0a4808b6132e5dfae73f352ce48748158ba99411 SHA-256: d30add8c369fd6b248ece926f3bf0ded93e4708c165cc1321af98921b49800b5

260 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1218.011 System Binary Proxy Execution: Rundll32 T1059.003 Windows Command Shell T1547.001 Registry Run Keys / Startup Folder T1190 Exploit Public-Facing Application

The file contains a Workbook_Open macro, a common technique for executing malicious code upon opening an Office document. The VBA code references cmd.exe and PowerShell, and uses WMI (Win32_Process) to launch processes, indicating an intent to execute further stages. The obfuscated VBA code suggests an attempt to evade detection, and the presence of these indicators points towards a downloader or dropper malware.

Heuristics 6

PowerShell reference in VBA critical OLE_VBA_PS

PowerShell reference in VBA
VBA WMI Win32_Process launcher critical OLE_VBA_WMI_PROCESS_CREATE

VBA macro builds or references a WMI moniker for Win32_Process and invokes .Create to start a command. This is a high-confidence macro execution chain that often hides the WMI class name through string concatenation or helper functions.
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
GetObject call high OLE_VBA_GETOBJ

GetObject call
cmd.exe reference in VBA high OLE_VBA_CMD

cmd.exe reference in VBA
VBA project inside OOXML medium OOXML_VBA

Document contains a VBA project — VBA macros present

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `3e2858410bac74798279786cb16b3c9c1fcec31b943bc5ad9b41cf44e0c428d6`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35170 bytes
`vbaProject_00.bin` `a55eec5426660e128c8e8aae4ea8be8cf54f5c0c6aabcbedb7343c6fb7194d84`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.